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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f3e35d4f8dcfba6b5a91cab8ab8066103420330fc04180737b8c09eb6fb8e2' 
  AND token = 'MOM8dTmbo5lCBMgdv+L78pPptWkrMNEnCT6m444gS+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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