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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056be3cfa13eb53b5bad3fff97a7b2d8c016780718760d0a2f3f26868cec7d66' 
  AND token = 'ajAKBQcN3T9Gb5KBqxKjTc/aLIMFpbjjPcPpnDIZ6kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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