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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d1164e5045b35f0547a5542364eca6977f0bbfc6fc92e8153efc63d23bcae6' 
  AND token = '54FTDXJG6PrrU56Tr8yfIO6hJS342tPzidzFY4SC+AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}