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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430209cfc51e1b1fca40234a4c451ea8940ad43b8b4b21189d98876f8307a351' 
  AND token = 'x6UW7b72rcalckXSV8KEaU/4MEK9nnZ9VKsilMw0weE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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