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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fb07b287c677e40e2575ec19bdfbc186ba890f7585b622c37bc57a27b6a485' 
  AND token = 'sYWOq1UifpvuoK/ulfbHnhcOsAbDKZRUIYWcxmYk9CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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