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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6bd31a6cc83234ace833c20a6ad4d414615ac348a697294a9d60b8796e8f8ac' 
  AND token = '4+lqnXdrVLNqSFuEENukgjOuIUOG6o3wi+1YiyqsgG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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