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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076dbf589b46c962fedf62d4fdd69a035ae14db4bea4816e1d21e33faa9b159c' 
  AND token = 'DCGzInGF4aRPsxqFftkrT/g/xy4LKE7TPbA6catYrqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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