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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845c0ff0728bc56f64fb3ed5e15503f7b826388d5fa80cac2a08f910563da4b0' 
  AND token = 'dKbfN/7OyHi42z9+Q1xpACyILLxF77wASkdU5h59ggU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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