SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6653c820d3f31e19d894759c572b42388f9b66f8525793273e3f75a91dd41c0' 
  AND token = 'u525HlXdW+RRtzy3eHCJ+2gaOGsfMq9r1Pxu+3VGv0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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