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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d7c9bf3f8eeec933d95f200cc130f3e60444e9c072d14c1e43bb12948b7008' 
  AND token = 'aJvWIUdn6jPDhYoHvAXivMnWN5eCC5ackdC196qyCD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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