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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6347d6e68a668f410b508febbded895ee689ea0eeb68eddd7e1d7d30fe33afb0' 
  AND token = 'eVWpTAKCR1JJ2r25MjWCFShLjYoygBviSMmutqauN6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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