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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b572a23abe2716dfabefe1f07535836ec4698687ed18bd848269728c4103f4a' 
  AND token = 'C4s5iqDm7oRaZZo+Hu8BqpkmpJHSxi7L2ImhPia0Yjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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