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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963c1dc9ed31f2b90f5d76ba25326fd328fb4021f259703bb4f3901e744142aa' 
  AND token = 'BtGaokeKnpcMWGU13sU2g0pJ3AyFEC4I8v6cK6S6zC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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