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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f43f137ac1e513b73ffe47c4883e7ccc88f1bf399f52484b5517abb044ccfa4' 
  AND token = '30F7jmq+kCUPhiCNbxioNWXGZotruJK3abEM/V6CI/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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