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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e58372304dfd35ffea3eeab0130fc7d8d8998d7595b49609392fb088144d10' 
  AND token = 'PV6q5FiBysh4C2v9WBYQL73Hd2dZH3ShkpN7rNFOdMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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