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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec5a27152e4e783fc7f67a9f8b4d7704794b848b14ccac7894c36c41b4776d6' 
  AND token = 'ThNFqJ0G5y7Vx5YBVJDvxpVf+ohMIpRRqDxy5jJD4e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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