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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89b320e7edfebf120ed3f9187178b5a6695a5358ca752d05aaf426d82dfc678' 
  AND token = 'Lu2YUWJnb/aZoPgQMvByomASAhnFDaG3YmJcfEFM9rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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