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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874361b4dc2e0ef4c21860ec166ab7eb3f2c500490f898b30344f18fbd001c86' 
  AND token = 'b4bNf9yx6uMq/YjE/97PVvb5cbpLeokLVFN3vDrZYig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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