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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc31807f5d7fbfd3475a542e0b7d98193c8ae8c054b1ccac61c2ed917a4a9e40' 
  AND token = 'RD0TMBucTS2yPOrwGnK8QTPwAw+m7Azz9xMf89DJgl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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