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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fd1b52f75ab2d53e62aa47fabc01a332cb0875244bec0397cfa527766c96d7' 
  AND token = '9JGQXF31o8Guxnf9cNLkMxHKphKOed0niSAz6fYIx3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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