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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5979cf1de24a0c69410dda099dc09b5f9dc22b68cc93a9f34bec47886113a4b4' 
  AND token = '7k5sht1mlR6TMyMZyntG2gTxxufX1+D43eiFuex6a7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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