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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff90bd6e5b7dfc57ea34c5750038cc0c77b75484faec6c3f9d232dbdaa09c85' 
  AND token = 'ubwrqZ4AZ94HLSYK8fC4ruHSFUryVFm0c0nl56GR6+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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