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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2535c75c7eccab021417721c01ba58e650b747c421f872d5490ac7890a9b2da1' 
  AND token = 'o1Axxp+NeGgzNjCk5AyJhgsmHxbnuml+/BC8vNtaVvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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