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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52dd3a9a89940b36d603e6b71c75bfb81593969f342f0a6cf1eb256c6f5ea145' 
  AND token = 'NUfCPQ/7FwqfgrpscnNsSZCw7aiIXx2QP9AFK5UqPGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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