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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6354646eb6996873ee13062ff65b3d04b113a14de935806d85ca636bae182fc' 
  AND token = '91GTqLoDu9LJaHtFy+9EIstGDSGuHHQanFlf78/JwGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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