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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0da918b2f8aa7bd6047a59e492b7cd6ecb1c07d7680a25cd0e59e3f06d5f86' 
  AND token = 'p3elsU7scOwOWOLMZj9XRCD/T8ft0KJ5MsVkFMRsmQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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