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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3b443cc3384b21b717b2b1f75e5948dfe8634f34d34f767c43ef8c594139a1' 
  AND token = '03z5HDrGCgGdVbeaW9ZAIKV/6IdgIODrSQDZpBn3/WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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