SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233d6b045520d02918b4cf8d96dffcbd3230974fd5f8c61e633bba03bb43d044' 
  AND token = 'qWuHJmpA4a8YLYaz0WSrPs+/LsxyhF+B+zPZgzJsqBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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