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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b4cd6763b5828a7d2b3afe31d46497fdddcb1a8c34ab2cabffefe178bd43d6' 
  AND token = 'j8s8KeQRxeYjX+ua/UeK+xWwHFV+SqOdC7QC+yu/wEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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