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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272788ca125270b9d8aceabd13d770799c8c238e7f73395fcaf9d2118e8e442e' 
  AND token = 'bW6uYlndVUBvBLFrc6I+wkM8zI6/CVCYuYx5HUe24P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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