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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4c67a2dd04b806a8c6323e465a89e0da90756272513467b0a535a4f1672096' 
  AND token = 'kvYM4X9e9DfYFuYAj3lwqEIbuqgpL7wksojUWNgEcMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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