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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3605d36f6d1b66e8c4e3ca681554e771645f3cf55a298e6ec55237f3c2a57482' 
  AND token = '3reHq0bc4TtQWNQAoDB6L0WFomcTx3ctkgT27xUvpmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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