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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058dfa2d4e7330dfd0737b847267e68f1ab091ad613ce8ddc53ec048e2bd0921' 
  AND token = '2edXGC8L4P2x3CtzLrj4Qx395Q7lswxCO9MqHmLoq68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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