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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6ce5d187a2dc01583de616a410474a025786b4e7369dc360a1e53f462b39a0' 
  AND token = 'Z8uRY0mV5Yse/xpDquQzICyr5dmI87mkSxWABUU7bYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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