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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c588649bbc65266c83ee9487933c77944b08d3fdcc28301b94a7747b5415c3' 
  AND token = 'eL19SOdxWOJyg12MwVqWt5nrZ7qXAoJX8JAH7kxFYWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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