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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5d2366c211fed0506266bf52f6d81fdb7a5392fac4cd3767f24affa65879e0' 
  AND token = '1VfNWQB70qvReK9Q8s0S7OMuH2LZW/lu6VYazmpwgc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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