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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428fd6fdbba1648a40c3b110a16d3e23a1eed36430730ed4f191e2173b8fe3e7' 
  AND token = 'TorhdYGyGZc3CGKCgHeUT8K3jcPmpT9yhufgWi5NgHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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