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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f95ddfa2f42c411ef02efc3396580cd7312be9ba1bae18ee33d60815a7d519' 
  AND token = 'U4M/NoqQhB6/dtKvWu7yh2bO+Tja6QFsMPPYRjPdhYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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