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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36037bc91ef1d32108702053d033090c45467cdcd0965236e693234e16d3b7d4' 
  AND token = 'J4lnASlMAzG14QbN7MQFy+1yZ+6U7VvZSfDIfuZmhAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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