SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02b4e5304b66ee88f7679258321271593892162c18cd9fb551a156925984811' 
  AND token = 'ZXXO4Ym+nccj6SJvJSY5GmbjMpUPICzbXlsJ7LQsI6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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