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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9869286b87c8481243680820425b66c15c558d4d10b5c0cad6790ad01f46e84a' 
  AND token = '1uEkKNUZOsAnzmHbN3AgQ4yElZ97R07iyffLgOAxUI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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