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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb58960783b5a8bc0d5dfbe9a0039e0fdfeac29070d27496d6f142064c8214a4' 
  AND token = 'nizIQI6OqjIwddpOeJhvcldWL3mTs+9yLiXbbOJ9zXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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