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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9d2b60fe182b76ccf7fdba599bafe5472fca1fd01779a633a4c75c166665238' 
  AND token = 'ZbuefN9GIB/3d+Su8rYHaKtY6oFbiMzSRgoxap4WVBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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