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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dfc01f675ec60fb9a322ce0bea76c52adf8250a33b916a47f723837363c908' 
  AND token = 'Wc8JJeGzfKNZE0Zpm3MpXMWG2CtxE2K+e2a3+VNN21s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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