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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44db4142950488bf8338059249de602873672d696137ea9d693677d1d4bd5841' 
  AND token = 'YK7jy2+e9p04BkHv5pp9VZ0NJbbrOWYnqywOwFL8t0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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