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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b052de7138b58ccd5d180d0f9d0dddd43c25527e5c1fd9e96e30548c61ca8cc2' 
  AND token = 'rFB27EURojA1EddrlzDfEbmnj/I6pfNORHmkY12FJmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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