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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7702a07d9442968601eb6d899b851fba4cead32a593fa95fcc5e63cbe2028d5' 
  AND token = '7Bi0N2ZE/zkEpLQ+lxZWz2Dc3Z0JsZXKT+vCPyT0ExY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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