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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c01628b52e789df61af5025ffe5dda2e6456316ae3467fa751ccb17fd69d62b' 
  AND token = 'gr8VIfYULoOgFb5UbJF2/mvRAHmY7HsWbhs/jATC3Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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