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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c266a4b66bcf0be6a67ca66ccd1ba4f6ff0c98ec05013cd05e5a4032c06ad75' 
  AND token = '5qlUZUwMeJq0BspaXknrICv8ZF3iqW3p/80dBrlGaGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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