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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579d9592a4af82c8dd0afc738a002f9a0963ae6b862df6d61dbffb8aeb3576b9' 
  AND token = 'oyL569p88EZBZ+lKrLAzX9S8lXXGpKNbhik5F7G5TkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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