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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164fdfb2be22505c54b6bb907175c8c9e5261871ee0837686b6dcf4ed8144ca0' 
  AND token = 'sgvTuk30+iFzEeeHLmgdQLQtNS6k9S6fUgp7FElaBJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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