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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6dfb27d17a178a4f4eab210ed2aca5ce73c1e38fcdb4f239046be54d86954e' 
  AND token = 'ffDx5uO0SY4huC4DCF5w549nikVQoc3qlOycA9eAJuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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