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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b860aa93b89445b421c405f4c6a21a9ccda4537547a97655e2c13fbb7d73b6' 
  AND token = 'tHbSnPZT1l+Pcltm0D1DxXDQikl+A1N2y2K89iAJlNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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