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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f81e212f0d163ddcd4f2189bab533799d69c59d832d12b102bfb22b3edf0d0f' 
  AND token = 'gwMqg3LwBfC3B6nWMHGK0dwO9vzUWKInZ+56Pv0QSRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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