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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4954c364af2280013700968d03337ff3d379134184ca1e5ebb05ab3c22eaedf' 
  AND token = 'kncPBn8Tl/c54P0za4VZMpPabXI0rJY2wv7RlHJPDos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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