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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21a9a4cc217e1c3f63ff605a64058fff83d12859b89c281ba94b0f1df91dc251' 
  AND token = 'wvtMTfaOCMbULXoO1BxeDFEzD+jQiXwf8CWblhwPXuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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