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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa52e98df7dee2e7339924e1f4ab66016eb43743fc8ec3fb2d96419b2770642' 
  AND token = 'hWUDuw5h+a0PWPM+7FdFd8LJOvNJPURv2myG67QSHs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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