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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f6d66e8887d2a6a4a23205af9ad197fa649ba4e7649b83874e6f4085ebc2ef' 
  AND token = 'wRTMb9d2o6ldjYncAtG9/S4eBxoH135jc8t/7DaWrCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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