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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76960fdfc3a1ee1b8bd4e53179a60cdf3038f96acc08906e2eda6111b3f83f3' 
  AND token = 'QNPbRCRR6qpa/68ZH6Rksae/Ha8DUTWODkUKtynEyIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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