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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a6df40b0f90dd1ffeac2d50141ab9ad8b5419b0ebb9e827484c447ea84a8b2' 
  AND token = 'HkeAkcDQ0syxCj65GOyZfJNga/Xr25BInWAJ0QrJkU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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