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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cb9d5334f8e08bcc903cbffd8952ee6c75bccf50bf5a57fdaac669e9dafd70' 
  AND token = 'xWUfF69AAq3ThSgNDgtkU7gGB0KyHyulEn+D/UKw/Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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