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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21627755bc6a4c276336dc192fd6d9d90a98a9925845d2fc80dad36fc33a7d5d' 
  AND token = 'fPINnFWfLE588OAtvRS2t1hEuwvZf6OdooPio1uW270=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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