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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cdbbb9c749b1ee821f5688c0816614c0c8b88e1e692d7981448280db7f084f1' 
  AND token = 'nQGcYcAGIJpJdOFtQqv3ZStjo5GMFtJ9KFVgu640FO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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