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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f36d9995ca49871ae6f2677ec4fd9dcf5ce3c5b4e811d53a80aa4cfe5619aa9' 
  AND token = '6hiCnz0cPx4PZUsVsLYmVoqxWHbvsifsX6MeamAuaMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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