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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516f98bb0c02ca6d99c6dfa29ab062ca2c1e964ebbf7c57e78fda566478868d9' 
  AND token = 'IdYmSFeEYp8pv8OfOm5eNj0L69QTabCl29s5mS7zo/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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